Which statement best describes the measurement purpose of wearing a personal sampling device (badge)?

• A. It calibrates the sampling pump automatically.
• B. It measures ambient air in the laboratory.
• C. It measures the general room conditions such as temperature.
• D. It measures the worker's actual inhalation exposure during their shift.

Answer: (D)

A personal sampling device worn by the worker is used to measure the inhalation exposure the worker actually experiences in their breathing zone over the sampling period. Because it travels with the worker, it captures the air they are inhaling during various tasks and locations, giving a time-weighted average exposure for the shift. It reflects how task patterns, movement, PPE, and micro-environments affect dose, rather than just the general air quality of the room. The other ideas involve functions handled by different instruments: calibrating the sampling pump is done with a calibrator before sampling; measuring ambient lab air is the job of stationary room monitors; and measuring room conditions like temperature is done with environmental data loggers, not with a personal badge. Therefore, the device’s purpose is to quantify the worker’s actual inhalation exposure during their shift.